Apparatus for dressing bits and rimmers



June 112, i923. 1,458,326 7 R. R, BLACKWELL APPARATUS FOR DRESSING BITS AND RIMMERS Filed May 5, 1922 1 O O IM/11W HUMP 0 z I H Patented June 12, 11.923.

insane ROLAND ROBERT BLACKWELL, O PEI'ROLIA, GNTARID, CANADA.

APPARATUS FOR DRESSING BITS AND RIMMEBS.

Application filed May 3,

To all whom it may concem:

Be it known that I, ROLAND R. BLACK- WELL, of the town of Petrolia, in the county of Lambton, Province of Ontario, Canada, a subject 01" the King of Great Britain, have invented certain new and useful Improvements in Apparatus for Dressing Bits and Rimmers, of which the following is a specification.

With the methods and apparatus used at the present time for dressing or sharpening bits or rimmers used in the drilling of oil and gas wells, this operation is a very dil'licult one, particularly as these bits or rimmers are of very large size.

The object of my invention is therefore to devise apparatus for dressing bits and riinmers which will simplify the operation and do the work more efliciently than with the methods and apparatus previously employed.

l attain my object by means of the constructions hereinafter described and illustrated in the accompanying drawings in which- Fig. 1 is a plan view of my improved apparatus, the mold being in position to receive the bit;

Fig. 2 a side view of the same, the mold being in closed position;

Fig. 3 a sectional view of the mold in open position; and p Fig. 4 a detail View at right angle to Fig. 3.

ln the drawings like numerals of reference indicate corresponding parts in the different figures.

1 is a support, which is adapted to be secured to the base of a power hammer. This support has a guide 2, which may be arc-shaped, formed at one end, on which is sli'dable a support 3, the guide being provided with undercut sides adapted to lit a correspondingly shaped groove in the lower side of the support 8. Suitable means, such as bevel gearing, will be provided for moving the support 3 on the guide 2. n

011 one end of the support 3 is secured a guide 8 and on the other end a tray 4 in,

which is mounted a series of rollers 5. In one end of the tray a is threaded a screw 5 and in the other end a screw 7.

The mold is divided longitudinally to form two main parts 9 and 10, the part 9 having an integral extension 11 at one side of its lower end, which extension 18 pro 1922. Serial 1\T'0. 558,237.

vided with a rib 12 on its upper surface havand through this lug passes a screw 14, the

end of which screw is threaded into a suitable opening in the part 10. From this construction it follows that as the screw .14 is rotated, the part 10 may be moved towards or away from the part 9.

To lock the parts 9 and 10 tightly together I provide the guide 15 secured to the part 9 and passing through an opening in the part 10. The part 9 is preferably provided with a suitable hole, and through this hole passes the end ofthe guide 15, which end is preferably of reduced size and threaded to receive a nut by means of which it is secured in position. i

The free end of the guide 15 is provided with a suitable slot 16, through which a wedge key 17 is driven when the parts 01 the mold are in closed position.

The upper ends of the'parts of the mold are clamped together by means of a suitable clamp, which comprises the members 18 and 19, one hingedly connected to each side of the part 9. 0n the free end of the part 18 is hingedly secured the member 20, the

end of which is provided with a tongue 21 adapted to engage in an opening 22 in the free end of the member 19.

Through the centre of the member 20 is threaded a screw 28, the end of which is adapted to bear against the upper end of the part, 10 and force it tightly against the part 9.

Each part of the mold might be formed of one piece, but I prefer to form the bit engaging portion as a separate part, and thus avoid the necessity of having toprovide a separate mold for each size bit it is desired to dress. 1

In each part of the moldI form an undercut groove 24:, in which is adapted to be received a bit-engaging portion 25. In the lower ends of the bit-engaging portions are formed holes through which pass the guide 15, and the bit-engaging portions are thus prevented from being pulled out of the grooves in the parts of the mold. The grooves 24-, must, of course, be large enough to receive bit-engaging portions adapted to receive the largest size bits, and the bit-engaging portions for the various sized bits will all'b'e of the same outside dimensions,

the size of the recess i'orrecei'ving the bit alone being different.

I Qn the sides of the part 9 of the mold are formed ribs 26 which are adapted to be received in grooves 21 formed in the sides of the guide 8.

- The apparatus is use as follows. It will be understood, of course, that the bit has been usedyand has become Worn down, and

the objectjof the apparatus is to restore the.

bit to its ori 'inal sha 3c. The bit 28 is first b l heatedin a'suitable forge and conveyed by a crane tothe steam hammer and screwed into the box 29 of the plunger of the hammer. Themold box is sitting on the rollers 5 1n. the tray4 withthe parts 9 and 10 in separated-position,- and the bit is placed in position between theparts. The screw 7 'is turned to force the part 9finto position against the bit, when the screw 14 is turned I to force the part 10 tightly against the part 9 to'hold the bit in position between the parts. The clamping means at the'top of the mold are then placed in clamping position and the screw 23 tightened up, while the Wedge keyl'? is driven into the slot'16. It should be stated that the box 29 of the hammer plunger is so arranged that itmay be rotated to bring the bit into proper position to bere'ceived in the mold.

When the bit is locked in the mold; the hammer is operated and the bit and the mold are lifted high enough so thatthe sup portB may be moved on the guide 2 to bring the guide 8 under'the plun I mer in proper position to receive the mold.

' When the mold is received in the guide 5,

the hammer plunger is operated until the" bit lS.ClIlVGD down until it accurately lits the'mold, the support 3 acting as an impact receiving member against which the mold is hammered.

When the operation is complete, the ham mer is'again" operated to lift the m'old irom the guide 8 and replace it in the tray a.

The clamp at theupper end of the mold is then released, the Wedge key 17 withd 'awn and the screw 14; turned to remove thepart 10'fromthebit. The screw 6 is then opera-ted to force the part 9 away from the bit,

thus completing the operation; These operations are necessary as the lower end of the bit is'llared and cannot therefore be inserted or'withdrawn from the mold by vertical movement.

' While my apparatus has been described as use'd'with a power hammer, it will be understood, or course, that the apparatus may beused with other machine "tools such, for example, as a bulldozer, in which the movement is generally substantially horizontal,

and in which case the guide 8 and mold would be arranged in substantially horizon tal position. I i

'er' of the 'ham From the above description it will be seen that l have devised apparatus which will satisfactorily attain the objects of my invention as set out in the preamble of the specification. What l claim as my invention 1S!" l. in a 3 )aratus for dressin bits the combination of a longitudinally! divided mold, one part bemg provided with an integral extension at its lower end on which the other part is rr-ctilincarl slidable to ooen and close the mold; an impact IGCGIVII'LQ' into contact with said member. I

ln apparatus for dressing hits, the combination of a longitudinally divided mold,

one partbeing provided with anintegral extension at its lower end on which theo th'er part is rectilinearly slidable to open and close'tlie mold; and a tray for receiving said mold. g

in apparatus IfOltll'QSSlIlg bits, the combination of a longitudinally divided mold;

one part being provided with an extension its lower end on which the other part is shdable to open and close the moldya tray for receiving said mold; and means moving said nold lengthwise of said tray. i, ln'apparatus for dressing bits, the combination of a longitudinally divided mold,

' member; and a guide for guiding the mold one part being provided with an. extension i ts lower end on which the other pal-t is slidable to open and close the mold; and a tray for receiving said mold, said tray being I provided with a screw at each end for moving the mold longitudinally of the tray. v

"5. ln apparatus for "dressing'bits, the. combination of a longitudinally divided mold, one part being provided with an extension at its lower end-on WlllCli the other part is slidable to open and closethe mold;

and a tray for receiving said mold, said tray having series of'rollers journalled therein.

(if-In apparatus for dressing bits, the

' combination of a longitudinally divided mold, one part being provided with an ex mold, one part being provided with-an 6X tension at its lower end on which the other part is slidableto'open and close the mold;

an impact receiving member; a guideJfor guiding the mold into contact with said member; and a tray for receiving said mold when it is removed from the guide.

8. In apparatus for dressing bits, the combinationof a base; a guide on "said base;

a support movable onthe guide; a vertical said mold lengthwise guide on the support; a positioning tray on the support; and a mold adapted to be received in said vertical guide and positioning tray.

9. In apparatus for dressing bits, the combination of a base; a guide on said base; a support movable on the guide; means for moving said support relative to the guide; a vertical guide on the support; a positioning tray on the support; and a mold adapted to be received in said vertical guide and positioning tray.

10. In apparatus for dressing bits, the combination of a longitudinally divided mold, one part being provided with an integral extension at its lower end on which the other part is rectilinearly slidable to open and close the mold; a lug on said extension; and a screw passing through said lug and engaging the last mentioned part of the mold.

11. In apparatus for dressing hits, the combination of a movable spindle to which a bit is adapted to be secured; a mold adapted to be clamped about said bit; an impact receiving member against which the mold is adapted to be hammered when said spindle is reciprocated; and a guide on said impact receiving member for guiding the mold into contact with said member.

12. In apparatus for dressing bits and rimmers, the combination of a longitudinally divided mold, the parts of which are mounted for movement to and from co operative position; an impact receiving member; a guide for guiding the mold into contact with said member; and a tray for receiving said mold.

13. In apparatus for dressing bits and rimmers, the combination of a longitudinally divided mold, the parts of which are mounted for movement to and from cooperative position; an impact receiving member; a guide for guiding the mold into contact with said member; a tray for receiving said mold; and means for moving said mold lengthwise of said tray.

14. In apparatus for dressing bits and rimmers, the combination of a longitudinally divided mold, the parts of which are mounted for movement to and from cooperative position; an impact receiving member; a guide for guiding the mold into contact with said member; and a tray for receiving said mold, said tray being provided with a screw at each end for moving the mold longitudinally of the tray.

15. In apparatus for dressing bits and rimmers, the combination of a longitudinally divided mold, the parts of which are mounted for movement to and from cooperative position; an impact receiving member; a guide for guiding the moldinto contact with said member; and a tray for receiving said mold, said tray having a series of rollers journalled therein.

16. In apparatus for dressing bits and rimmers, the combination of a longitudinally divided mold, the parts of which are mounted for movement to and from cooperative position; an impact receiving member; a guide for guiding the mold into contact with said member; a tray for receiving said mold, said tray having a series of rollers journalled therein; and means for of April, 1922.

ROLAND ROBERT BLACKWELL. [L.s.] 

